Final answer:
Lydia's secret wedding plans are not clearly shared with any character in the provided passages. Themes in the texts revolve around secrecy and confidentiality in relationships, but there is no explicit mention of Lydia disclosing her wedding plans.
Step-by-step explanation:
Lydia, from the given passages, does not explicitly share her secret wedding plans with any character. The various texts hint at secretive and quiet weddings, but none of them directly reference Lydia revealing her wedding plans. Torvald, in a passage, imagines he and Nora are in a secret love and secretly promised to each other, emphasizing the theme of secret plans and relationships. In another instance, a character discloses a reluctance to have a wedding in a specific room, discussing this with another character, but this does not relate to Lydia nor does it confirm that Lydia shares her secret wedding plans with anyone.
From the collection of texts, it appears that confidentiality and secrecy are significant themes related to marriage and relationships, but none provide conclusive evidence about Lydia's confidant concerning her wedding plans. These texts discuss secret affairs and arranged marriages, but Lydia's personal secret sharing is not detailed.